מוסר אויף בראשית 5:1

Chapter 1 - That it is fitting for a person to resemble his Creator: It is fitting for a person to resemble his Creator and then he will be [configured] in the secret of the Highest Form, [both] in image and likeness. As if he is alike in his body but not in his actions, he betrays the Form; and they will say about him, "A lovely form, but ugly deeds." As behold, the essence of the Highest Image and Likeness is His actions. And what will it benefit him to have the structure of his limbs like the Highest Form, but not resemble his Creator in his actions? Therefore it is fitting that he should [make his actions] resemble the actions of the Crown (Keter), which are the thirteen highest traits of mercy. And they are hinted to in the secret of the verses (Michah 7:18-20), "Who is a power like You; He will again have mercy on us; You shall give truth." If so, it is fitting that these thirteen traits [also] be found in man. And now we will explain these thirteen actions that are fitting to be with him.

Bereshit Rabbah 24,6 comments on Genesis 5,1 זה ספר תולדת אדם, "This is the book of the descendants of man," that those mentioned now are descendants, whereas the previous ones were not descendants. What then were the earlier ones? Were they deities perhaps? [sarcastically] The answer given is that the generations אדם-שת-אנוש were indeed תולדות. [The Midrash goes on to elaborate on all the changes that took place on earth during Enosh's lifetime, indicating a radical decline in man's spirituality. Ed]